First of all take ot Relinquished because he doesen't belong in this deck.Then continue by adding some cards that can help your deck.You must keep in mind that Gravekeepers are DARK Atribute monsters so you cal always add Allure of Darkness,Dark Armed Dragon,Gorz,Caius the Shadow Monarch.Don't put cards in a Gravekeeer's deck just because they have Gravekeeper's in the cards name.Here's how I would do it:
Gravekeeper's Commandant x3
Gravekeeper's Assailant x2
Gravekeeper's Guard x3
Gravekeeper's Spy x3
Gravekeeper's Spear Soldier x2
Gravekeeper's Chief x2
Gravekeeper's Visionary x2
Dark Hole x1
Allure of Darkness x1
Necrovalley x3
Book of Moon x1
Gravekeeper's Stele x1(you can put 2 if you want to use your Graveyard a little more)
Mystical Space Typhoon x1(you can put 2 if you'd like)
Smashing Ground x2(or Shrink,Enemy Controler)
Burden of the Mighty x2
Compulsory Evacuation Device x3(you can use it on your own monsters as well)
Dark Bribe x2(or Magic Jammer or evem both in case opponent uses spells/traps on Necrovalley)
Mirror Force x1
Solemn Judgment x1
Torrential Tribute x1
Trap Hole x3(or Waboku,Threatening Roar)
Made this deck for you if you want to use ONLY Gravekeeper's but you can add cards that I mentioned above.You can add other spells like Cold Wave or if you are having a tough time fighting Stardust Dragon try to aquire cards that have "send to the Graveyard" instead of "Destroy a monster/monsters you opponent controls".I hope this helps and good luck with you Gravekeeper's deck.They are one of my favorites.